provost



,Patented Feb. 1, 1927.

narran #Ster-ES terasse .rerse pr er1-tiefe."

(DOUBLE 4CEE-sr ELUG.

,Application flledpriLOylS. :SerialNe 1055.35!

The present inventionrelates'to adouble test plug suchhas is in ycommon, u sevin' testing the `draw-in` and stack systemlofuany plumbing system, all suchplugs, now on the .market having the disadvantagepf not-.beingvadjustable to the'fitting'sof rvarying.lengths The rubber rings fof, these plugsbeary fully against the fitting, andon being compressed, c utby the edge vofthe fitting.' It often. he? pensalso that thefittings, yare tool long or tooshort tol take thetestplug atv all,an dvcon plug of this nature which is exceedingly simple in its construction, easy to adjust, inexpensive to manufacture, not likely to easily become out of order, and otherwise well adapted to the purpose for which it is designed.

lVith the above and numerous other ob- Ijects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

1n the drawing rlhe figure is a longitudinal section through the double test plug embodying the features of my invention.

Referring to the drawing in detail, it will be seen vthat the letter A designates generally the lower plug and the letter B the upper plug. The lower plug A includes the usual bottom casting 5, rubber ring 6, and upper casting which is of a frusto-conical formation so that the center thereof may be moved downwardly for expanding the rubber ring 6 in the fitting. Plug B includes a bottom 8, a rubberl ring 9, and a frusto-conical shaped top casting 10. A rod 11 is threadedly engaged at one end to the center of the bottom as at 12 and extends upwardly through a tube 13 threadedly engaged with the center of theupperycasting 7 :as at`14. LT hetfube y13 andthe rod 11 yextend through openings provided inthe castings 8v and 10. y

flheuppery endfof the tube 13 is reduced as atvlf' for the purpose of formingfa'shoulder. Anut l16 havingan operatingwheel 17 is threaded on the upper portion ofthe rod 11 for engaging the shoulder lfso thatthe tube 413fmay`,bemoved downwardlyover the rod 11V for the purpose"ofY expanding the ring 6 ina fitting. A lock nutflS is also threaded on theupper end Vof the rod 11 to anchor handle 19 to rod 11. ik tube20. isA threaded-l ly engaged'with the bottom .casting 8 asat 21, and extends. upwardly through the open- 71.

ing in the top casting `10, and the portion of the tube above the top casting isfthreaded onits exterior surface forthe purpose of receivinga wing nut 22.?whichkengages the casting 10 for the purpose of expanding the `ring 12 ina casting. fThe tube.20 extends about the tube 13 in spaced relation thereto.

A coupling or fitting 23 is threadedly engaged on the upper end of the tube and has a stuffing box 24 engaged about the tube 1,3. A cock 25 is engaged in the fitting 23.

From the above detailed description, it will be seen that my novel contribution to this art includes particularly7 the sub-combination made up of the plug B with its tube 20, fitting 23, the stuffing box 24. These elements forming the sub-combination, may be used on practically all of thetest plugs now on the market in place of the usual top plugs. This sub-combination acts as anadjustable unit in sliding up and down on the tube 13, so theeupper rubber' ring can be placed as may be necessary to hold tight when the nut 22 is actuated. The -various plumbing fittings on the market are made in diderent lengths and if the rubber rings are used correctly, they will last some time.

If they arerused so as to engage right on the edge of ay fitting, it will be found that after a very few usages, the rubber rings become cracked and useless.

Theadjustment provided by the sub-comv holding handle 19 and turning down on y wheel 17, the rubber ring 6 is expanded or bulged outwardly to engage the inside Wall ofthe pipe or fitting or to make a tight joint therewith.- The sub-combination unit mentioned above, may then be pushed downwardly to the place desired and the rubber ring 9 engaged by actuation of the nut 22.

The job can then be filled with water inthe usual well known manner. In case the mechanic desires to drawL the water out over n1ght,th1s may be accomplished by turnlng wheel 17 and on resuming the test the Wheel l13 maybe turned in the'opposite direction for tightening the band' so that there is no time lost in cutting or fitting of plugs at every test. y l

It is thought that the construction, operan tion, and advantages of this invention will now be clearly understood Without a more detailed description thereof. The present embodiment of the invention'has been disclosed in detail merely by way of example,

vsince in actual practice, it attains the features of advantage enumerated as desirable in the statement of the invention and the above description. p

Numerous changesA in the details of construction, and in thel combination and arrangement Vof parts may be resorted to with! outk departing form th-e spirit or scope oi casting and ajtop lrusto-conical shaped casting, a tube engaged ywith the center of the top casting and extending upwardly therefrom, a rodv engaged with the center of the bottom casting and extending up# Wardly vthrough the tube,L a nut threaded on theupper end of the rod for engaging the upper end of ,thev tube for `expanding the ring, a top plug comprising a second bottom ycasting disposed about the tube, 'a second ring thereon,` and a second topy 'frusto-conical casting disposed about the tube, a second tube engaged with the center of theV second bottom casting and disposed about the firstl tube in spacedr-elation thereto and extending through the top casting of lthe upper plug, a nut threaded on the second tube for engaging the second upper casting, a fitting on the second tube including ar stuliing box engagingv the first tube for allowing the second tube to be slid over the lirst tube, and a v cock in the fitting.

In testimony whereof I allix my signature.

HENRY J. PROVOST.l 

